5
BS EN 15287-1
ACCEPTABLE ALTERNATIVE
METHODS OF CONNECTION
Where a horizontal connecting flue of more than 150mm is required to connect a solid fuel fired appliance to a chimney,
an installation method as per the examples below may be used provided the following criteria is met:-
a) The maximum length of horizontal connecting flue pipe does not exceed 450mm;
b) A Defra exempt appliance or an appliance, which is limited to burning authorised smokeless fuel only, is installed;
c) A calculation according to BS EN13384-1 has indicated safe operation of the proposed configuration, and the results
of the calculation are left with the householder along with the appliance installation instructions;
d) The appliance manufacturer agrees in writing to the proposed configuration;
e) The chimney manufacturer agrees in writing to the proposed configuration;
f) The total length of single wall connecting flue pipe is not more than 1.5m;
g) The appropriate distances to combustible materials from both the appliance and the connecting flue pipe are maintained.
Top Outlet Single Wall Connecting
Flue Pipe through Solid Wall into
Twin Wall System Chimney
NB Where the connecting flue pipe from
the appliance passes through any wall other
than the existing chimney wall, the connecting
flue pipe must be a System Chimney of twin
wall insulated design.
Top Outlet Twin Wall Connecting
Flue Pipe through Solid Wall into
Twin Wall System Chimney
For minimum distance for
this configuration check
manufacturers distance
to combustibles
Measured from back
of appliance to outside
surface of chimney
Measured from back
of appliance to liner
of masonry chimney
Twin Wall
Chimney System
300
Wall Support
Tee Cap for
Debris Collection/
Cleaning Access
Wall Sleeve
Trim Collar
Cavity Wall
Wall Band
450mm MAX
300
450mm MAX
External Masonry
Chimney System
Inspection/
Cleanout Door
Cavity Wall
Wall Sleeve
Trim Collar
Debris
Collector
Wall Sleeve
Trim Collar
100
100
225 square
(9” x 9”)
Flexible Twin Wall
Chimney Liner
Chimney Wall
Support Bracket
Swept Elbow
Sweep access
Tee Piece
Single Wall to
Flex Connector
450mm
MAX
Measured from
back of appliance
to flue liner
Wall Support
Measured from back
of connecting flue
pipe to outside
surface of chimney
Tee Cap for
Debris Collection/
Cleaning Access
Twin Wall
Chimney System
Solid Wall
Inspection Bend
Wall Sleeve
Trim Collar
600 min
225
For minimum distance for
this configuration check
manufacturers distance
to combustibles
No further
bends allowed
on this
configuration
Wall Band
450mm MAX
Measured from back
of connecting flue
pipe to outside
surface of chimney
Tee Cap for
Debris Collection/
Cleaning Access
Twin Wall
Chimney System
Solid Wall
Inspection Bend
Wall Sleeve
Trim Collar
225
Wall Support
Wall Band
450mm MAX
600 min
For minimum distance for
this configuration check
manufacturers distance
to combustibles
No further
bends allowed
on this
configuration
Flexible Twin Wall
Chimney Liner
Inspection/
Cleanout Door
Inspection Bend
Wall Sleeve
Trim Collar
Chimney Wall
Support Bracket
Tee Piece
Tee Cap for
Debris Collection/
Cleaning Access
Single Wall to
Flex Connector
225 square
(9” x 9”)
450mm
MAX
For minimum distance for
this configuration check
manufacturers distance
to combustibles
For minimum distance for
this configuration check
manufacturers distance
to combustibles
For minimum distance for
this configuration check
manufacturers distance
to combustibles
Measured from back
of connecting flue pipe
to flue liner
No further
bends allowed
on this
configuration
600 min
100
100
